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gpiolib: don't allow OPEN_DRAIN & OPEN_SOURCE flags simultaneously
Do not allow OPEN_SOURCE & OPEN_DRAIN flags in a single request. If the hardware actually supports enabling both at the same time the electrical result would be disastrous. Suggested-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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@ -459,6 +459,15 @@ static int linehandle_create(struct gpio_device *gdev, void __user *ip)
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if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS)
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if (lflags & ~GPIOHANDLE_REQUEST_VALID_FLAGS)
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return -EINVAL;
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return -EINVAL;
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/*
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* Do not allow OPEN_SOURCE & OPEN_DRAIN flags in a single request. If
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* the hardware actually supports enabling both at the same time the
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* electrical result would be disastrous.
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*/
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if ((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) &&
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(lflags & GPIOHANDLE_REQUEST_OPEN_SOURCE))
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return -EINVAL;
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/* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */
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/* OPEN_DRAIN and OPEN_SOURCE flags only make sense for output mode. */
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if (!(lflags & GPIOHANDLE_REQUEST_OUTPUT) &&
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if (!(lflags & GPIOHANDLE_REQUEST_OUTPUT) &&
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((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||
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((lflags & GPIOHANDLE_REQUEST_OPEN_DRAIN) ||
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